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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcad892e47d1ec42b4d72717f391a7e5aa789f41d2222031854d92b0e4f7cde3' 
  AND token = '3AQcHafnHFzHJpcpe6VGSBNdthHDiXHWkPw+l+URJJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}